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    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>zgrid</b> -  zgrid plot</p>
    <h3>
      <font color="blue">Calling Sequence</font>
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    <dl>
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        <tt>zgrid()    </tt>
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    <h3>
      <font color="blue">Description</font>
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    <p>
    plots z-plane grid lines: lines of constant 
    damping factor (zeta) and natural frequency (Wn) are 
    drawn in within the unit Z-plane circle.</p>
    <p>
    Iso-frequency curves are shown in frequency*step on the
    interval [0,0.5]. Upper limit corresponds to Shannon
    frequency <tt>
        <b>( 1/dt &gt; 2*f )</b>
      </tt>.</p>
    <h3>
      <font color="blue">See Also</font>
    </h3>
    <p>
      <a href="../control/frep2tf.htm">
        <tt>
          <b>frep2tf</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="../control/freson.htm">
        <tt>
          <b>freson</b>
        </tt>
      </a>,&nbsp;&nbsp;</p>
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